Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b7d434690cd1af…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 11:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87d52d7bdfd90aed5ec3d2da10ceaed5 SHA-1: 70b83693a0caeda9094dffa531323403210f8dcc SHA-256: 68b7d434690cd1af2c55c9ba8b043822f9fcbca2b6fe166be146071884803e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to external sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=city+island+2+hack+apk PDF link annotation
    • http://ubytovna-krumlov.cz/userfiles/file/ginimogemuxotaxixixutesot.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/mibobapajopelu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbc4d86f0---daxuref.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/gasalezagomaxarajesu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/216f27718c378258994ab9b6357921e6/17250971844.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/12207c7ae1446e41f91203e98a2a1a80/xegomuw.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/18654125558.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210906021417710026id7ix.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/94920080951.pdfIn PDF document text
    • http://co-mit.com/uploads/files/7872646615.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/29940212132.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021981925366377.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/93589085030.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/30741591314.pdfIn PDF document text
    • http://caramelitos.sk/files/7691441089.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33e8e8079---xudasazadulosimibuzabi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5629e1a1e---nezowolopufutifi.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/16702519604.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905050950.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vulopimujut.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109022233184118.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/zosivuka.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210902113332.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4c0b8f8a7c53b4868c8f6e89faa9522f/zorubugigif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 17092 bytes
SHA-256: 1bd0c7adb9b14a8e14d8d3f526c817f0d3ebeff461f923cb04f72c080b001dcc
font_01_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 10616 bytes
SHA-256: 9df562d43f0df2820476c9f5cb0a91fb38f07f50089291e7cda6dfa2ce3c87d0
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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